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<br />The National Park Service operates domestic water wells at Wahweap, a <br /> <br />recreational community on the shores of Lake Powell. The amounts of water <br /> <br />o pumped from these wells are shown in Tab Ie l. Part of the water was used for <br />("~) <br /> <br />w <br />C) <br />Q) <br />o <br /> <br />landscape irrigation and a minute portion probably returned to Lake Powell <br /> <br />through deep percolation. The remainder of the pumped water was used for <br /> <br />domestic purposes by the residents, tourists, and concessionaires. Wahweap <br /> <br />has a sewage treatment plant which terminates in evaporation ponds. <br /> <br />Records of water usage at the Navajo Powerplant were supplied by the <br /> <br />Navajo Project Generating Station. The water year values are shown in Table 1. <br /> <br />This water is pumped from Lake Powell and is entirely consumed. <br /> <br />Conclusions <br /> <br />The estimated consumptive uses and losses in the Arizona portion of the <br /> <br />Upper Colorado River Basin for the 1980 water year is shown in Table 1. The <br /> <br />values shown for Page, Wahweap, and Navajo Powerp1ant represent water pumped <br /> <br />from Lake Powell (or from shoreline wells) and clearly represent a depletion <br /> <br />to the Colorado River at the Compact Point. The remaining consumptive uses <br /> <br />and losses are "on-site" and do not necessarily represent a corresponding <br /> <br />depletion to the Colorado River. <br /> <br />The drainage system of the study area is <br /> <br />characterized by sandy washes which only intermittently contain a flowing <br /> <br />stream. No doubt if the "on-site" depletion water had been allowed to flow <br /> <br />downstream, SOme of it would have been lost through channel evaporation and <br /> <br />phreatophyte growth. It is at present impossible to estimate with any aSSur- <br /> <br />ance what proportion of this water would have been naturally lost before <br /> <br />reaching the Colorado River at the Compact Point. <br />